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24 October 2017 Measurement of trace gas concentration with pressure-calibration method based on wavelength modulation absorption spectrometry
Kunyang Wang, Jie Shao
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Proceedings Volume 10461, AOPC 2017: Optical Spectroscopy and Imaging; 104610F (2017) https://doi.org/10.1117/12.2282887
Event: Applied Optics and Photonics China (AOPC2017), 2017, Beijing, China
Abstract
A theoretical description of pressure-calibration method based on wavelength modulation absorption spectrometry (WMAS) with second harmonic detection for precise measurements of trace gas concentration will be present in this paper. The method can obtain the consistent relation between gas concentration and second harmonic signal in pressure changes. The signal is monotonic function when gas concentration as metrics and it becomes a complete linear function when density of particles number as metrics. It not only allows complying with traditional WMAS technique without any calibration methods, but also applying to various environment of pressure variations. Typical applications like environmental monitoring and remote sensing can be used this method to calibrated measurement results. In addition, the method is not restricted to situations with typical applications. Furthermore, it can also easily be adapted to various gas concentration detection under pressure changes. The pressure-calibration method can be useful for gas concentration measurements so that assist to ensure the accuracy of data in research.
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Kunyang Wang and Jie Shao "Measurement of trace gas concentration with pressure-calibration method based on wavelength modulation absorption spectrometry", Proc. SPIE 10461, AOPC 2017: Optical Spectroscopy and Imaging, 104610F (24 October 2017); https://doi.org/10.1117/12.2282887
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KEYWORDS
Absorption
Modulation
Spectroscopy
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